Dark-room lantern



W. A. BELL.

DARK ROOM LANTERN.

' APPLlcAloN FILED JuLY 18. '1.9.8.

1,374,714. Patented Apr. 12,1921."

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W. A. BELL.

l DARK ROOM LANTERN.

Y 'APPLICATION man JULY 1B. 1918. Patented Apr. 12 1921.

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W. A. BELL.

DARK ROOM LANTERN.

APPLICATION FILED JULY1S, 198. 1 ,374,714. Patented Apr. 12, 1921.

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awww/hoz Waffe?" )gell UNiTED STATES WALTER A. BELL, or NEW YORK, N. Y.

DARK-ROOM TERN.

, Specification of Letters Patent.

ratenteaApr. 12, 192,1.

Application filed July 18, 1918. Serial No. 245,440.

To all whom t may concern.'

Be it known that I, WALTER A. BELL, a

y citizen of the United States, and a resident oi the city?, county, and State of New York, have invented a new and useful Improvement in Dark-Room Lanterns, of which the following is a specification.

lhe object of my invention is to provide a dark room lantern of a portable nature which can be used at the option of the operator so as to render a red light, a green light, no light or a pure diffused white light, as may be required-by the peculiar conditions or place in the dark room and in due course of developing. .These and other objects are accomplished by my invention, one embodiment of which is hereinafter more particularly set forth. a

For a more particular description of my invention, reference is to be had to the accompanying drawings in which-1 Figure 1 is a longitudinal section of my improved lantern. Y

F ig. 2 is a .cross section taken substantially on the line 2-2 oi' Fig. 1 looking in the direction oi the arrows.

Fig. 3 is a sectional view of the upper portion o my improved lantern taken at right angles to the view shown in Fig. 1.

Fig. 4 is a sectional View taken o n the line 4**4 of Fig. 3 looking in the direction of the arrows. o

Fig. 5 shows a front elevation of my iinproved lantern.

Throughout the various views of the `drawings, similar reference characters designate similar parts. l

My improved lantern 1 has an outside casing 2 which is composed of a cylindrical shell 3 with a lat front 4, a bottom 5 and top 6. rlhe bottoni is preferably made of iiat metal which is rigidly secured to the cylindrical wall 3. The top is also made substantially integral with the wall .3 except that it has hinged cover 7 which is preferably closed by a light` tight joint and in the preferred embodiment of my invention is hinged at 8. This top 6 is provided.

with an insulating bushing 9 through which passes a double cable 10 whichruns to a"V suitable-glow lamp 11 mounted in the conventional way in the front upper corner of the casing 2 and under a reflector 12. All metal parts, on which the light from the glow lamp 11 falls directly., are painted white so as to give an even and diffused light No direct light isthrown on a glass at any time. A covering plate 13 is placed'over the conductor 10 where it enters the interior or' the casing 2 as shown in Figs. 1 and 3, so f as to prevent light from leaking in through the insulator 19 and about the cablelO. y

A little below the top and extending near the bottom, is a suitable reiiector 14 which is preferably made in the forni of a cylin drical shell extending about 180 degrees. At its upper edge, this reiiector is held in place by means of suitable brackets 15 Vwhich run radially to theshell 3, as shown in Fig. 4, and at its lower end this reflector 14 is held by a radial bracket 16 that runs to a pivot 17 which is fixed at the center of the bottom 5. f Y

This pivot 17 is also iixed in a disk 18 which has a single notch 19 which isadapted to be engaged by one of four spring pressed pawls 2O which are pivoted in the bottom 2 of the rotating glass holder 22.

The upper end of the rotating glass holder 22 bears against the under sidel and the in-y side edge or an angle strip 23 which is xed below the brackets 15 tothe cylindrical wall 3 and .false front. wall 24. To make this t good and tight at "all times and lin all posivided with va top ,25 which rests under the angle plate 2,3 and from this top upwardly a cylindrical flange .26.

The bottom 21 of the rotary glass holder 22 has tour elongated slots 27 through which protrudek pins 28 which are attached to coil springs 29 that run to pins 30 extending upwardly from this bottom 21. The bottoni 21 alsoV isprovided with suitable pivots 31 on which the pawls 20 are mounted. The pins 28 which pass through the slots 27 are also fixed to these pawls -so that their ends are normally kept in engagement with the disk 13 andv one of these four pawlscan lock the bottoni21 so that one of its edges is always parallel with the front of the instrument, when `so locked. Y The direction of rotation'is always anti-clockwise and is caused by pressing the thumb of the operator against the left handv vertical faceV of a pawl 20. f

The glass holder 22 has four vertical walls one of which is numbered 32, which has at 25 extends each vertical edge, suitable run ways 33 to ioo opposing run ways 33 at the other corners are for the same purpose and these run ways at the top and bottom are connected by suit# able strips 34 which make three jtrames for the glass. One glass is red and is preferably placed opposite the side 32. This is numbered 35. Another glass, which follows the red, is preferably made green and this is numbered 36. rlhen comes the opaque side 32 and after this a plain glass 37. The glass may be inserted or removed by raising the cover 7 and then sliding the glass upwardly between the false front 24 and the liront 4, one glass being removed at a time when at the front or" the instrument. An opposite movement permits an insertion of the glass.

To make the front of the lantern 1 absolutely light proof except Jfor the light transmitted through the glass, the iront edges or the shell 3, see Fig. 2, are thrown out and back at 3S to receive and hold leather pads 39 which extend inwardly and press against the corners of t-he holder 22. The top of the opening is protected against light leakage b v means of the hinged `flan a0 which' is pivoted at its upper edge by a spring hinge 41 that presses against the upper front edge or corner of this holder 22.

Operation.

1n view of the foregoing, the operation of' my improved lamp 1 will be readily understood. 1f an ordinary plate is being developed, the red glass is sutllcient and may be used. 1f a color plate which cannot be developed with red light is being developed, the protruding pawl 2O is pressed and the green glass is presented opposite the opening. 1f darkness is desired, the pawl 20 is pressed and Vthe side 32 closes the opening. 1f a clear diffused light is desired, such as is ordinarily derived from sky lights, it may be obtained by turning the part 22 the same as before and bringing the clear glass to the front. A mounted that it must always be turned one way so that the operator knows that red, green, darkness and diiiused light will tollow each other inthe order given and he will use whatever he may require for his particular work. rl`his lamp 1 may be used anywhere as it is portable. 1t may be used in connection with X-ray work or color photograph7 in hospital or other work,

any desired place. By changing the color ot the glasses, any kind of dark room work may be done.

While 1 have shown and described one embodiment of my invention, it is to be underrlhis part 22 is so constructed andV Vhat 1 claim is:

1. 1n a device of the class described, a casing, a reflector therein, an incandescent lamp below the reiiector and adjacent to the same so that the lamp will throw a diffused light in the casing and a rotary frame mounted in said casing with opaque, transparent and colored sides so that when the device is in use, diffused, colored light, or no light may be thrown from the apparatus.

2. 1n a device oic thevclass described, a casing painted white in its interior and with a lined white reflector mounted therein.I a trame pivoted so as to surround said re- Hector and carrying an opaque side, a white transparent side and a colored transparent side, the said parts being so arranged and disposed that ditlused light only may be thrown from. the apparatus or no light according to which side et the trame is brought to the front.

3. ln device of the class described, a casing withl a` source of light mounted therein, a reflector back of said source oli light, a reflector in front of said source of light and a pivoted glass holderrevoluble about said last named reflector.

d. 1n a `device of the class described, a casing with an angle plate mounted therein, a source or" light in said casing, a glass holder pivoted in said angle plate and casing and a paw] and ratchet connection between the glass holder and the casing so that the glass holder may be turned continuously in one direction only.

5.1n a device oit the class described, a casing with an opening in its front, a source ot' light in said casing, pads on the sides ot the' said opening, a rotary glass holder mount-ed in said casing and means for permitting the lglass holder to rotate in one direction so that its corners will rub against said pads.

6. In a device of the class described, a casing with an opening in its iront, a source of light in said casing, a rotary glass holder mounted in said casing and a hinged flap mounted on the top of said opening and adapted to rub said glass holder when the same is shifted.

7.4111 a device or the class described, a casina with a top and a bottom, a source of di'used light in' said casing, a hinged cover mountedin the top, a reflector, a second reflector in front ott said source of light, a rotary glass holder and means for mounting the same in said casing. means'in said glas-s holder for receiving glass and permitting the same to be removed or inserted and means for shifting the glass holder.

WALTER A. BELL. 

